Add missing line mapping for table rows

fix https://github.com/markdown-it/markdown-it/issues/705

lib/rules_block/table.js

@@ -175,11 +175,13 @@ module.exports = function table(state, startLine, endLine, silent) {
     token = state.push('tr_open', 'tr', 1);
     for (i = 0; i < columnCount; i++) {
       token          = state.push('td_open', 'td', 1);
+      token.map      = [ nextLine, nextLine + 1 ];
       if (aligns[i]) {
         token.attrs  = [ [ 'style', 'text-align:' + aligns[i] ] ];
       }
 
       token          = state.push('inline', '', 0);
+      token.map      = [ nextLine, nextLine + 1 ];
       token.content  = columns[i] ? columns[i].trim() : '';
       token.children = [];